The inadequate description and poor figure quoted, suggest, but fail to demonstrate, that a shell figured herewith should be so named. The species is represented by a single, perforated and decollated example from the Funafuti lagoon. It is 5,5 mm. in length, has thirteen whorls remaining, and in colour is ochraceous splashed with white. The last whorl has six spiral ridges, two of which are basal; the three preceding whorls have each three, and those above each two such ridges. The ridges are smooth, elevate and keeled, the anterior of each series the larger; on the upper whorls the posterior ridge tends to divide into heads. The inter-stices are broad, deep and finely spirally grooved. The spur of the outer lip crosses the pillar. Anal notch deep and cordate. Canal short and perpendicular.
Pease described T. incisus from Hawaii. I have collected at Port Moresby, British New Guinea, what seems a form of that described above. It differs in colour being variegated with black, chocolate and white. The uppermost ridge has not the same disposition to become beaded but longitudinal plications are developed in the interstices. The protoconch in these Papuan shells is six whorled, bicarinate and crossed by coarse bars, like the apex I figure for O. obesula.

Viriola incisa (Pease, 1861). Length, 12 mm; diameter, 3 mm. Shell: conic-elongate, turriculate; with three spiral keels of the same size; dark brown mottled with light brown. Spire: protoconch acuminate, of three to five dark brown whorls, the apical whorl smooth, the others unicarinate and with axial threads, the abapical whorl prominently bicarinate; teleoconch of straight-sided whorls; suture shallow. Sculpture: three spiral keels of about the same size on each whorl, the interspaces smooth or marked with fine striae. Aperture: subovate; posterior canal nearly closed, circular; anterior canal tubular, recurved. Color: brown marbled with varying tones of lighter and darker brown.
These triphorids are common in shallow water, on the undersurfaces of rocks on reefs and in shallow bays; shells have been dredged from depths of 8 to 50 m.
V. incisa was described from the Hawaiian Islands, but ranges throughout the Indo-West Pacific from the Cocos-Keeling Islands, to the Philippines, southern Japan, Amami Islands (Kosuge, 1961b), Micronesia, and Polynesia. In sculpture and color the teleoconch is indistinguishable from that of V. fallax but the shells of V. incisa are consistently larger and the protoconch is larger and prominently bicarinate.